PatchTheCVECVE-2026-115774: Twisted is an event-based framework for internet applications, supporting Python 3.6+
CVE-2026-115774 is a medium-severity flaw (CVSS 4.9) affecting affected software. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.mail.imap4.IMAP4Server reaches twisted.mail.imap4.parseNestedParens with a negative literal size in an authenticated SEARCH command after the client enters the selected mailbox state. The negative size moves the parser cursor below zero, and Python's negative indexing prevents the synchronous scanning loop from terminating. The loop
Why this priority
- No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Last updated 2026-10-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-115774?
No fixed release is listed yet. Watch the vendor advisory and apply any mitigation shown on this page.
Is CVE-2026-115774 being exploited?
CVE-2026-115774 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-115774 affect?
CVE-2026-115774 affects affected software. Severity is medium (CVSS 4.9). Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.mail.imap4.IMAP4Server reaches twisted.mail.imap4.parseNestedParens with a negative literal size in an authenticated SEARCH
How urgent is CVE-2026-115774?
Priority 29/100. No elevated risk signals yet.